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Safety Slew and CP3 mounts?

Jeffc #85897 I was wondering about Safety Slew in the context of CP3 mounts. First tho, I had a question: .What is the purpose of the “safety slew”? And I found the answer in the docs: https://astro-physics.info/tech_support/mounts/servo/cp4-manual.pdf When counterweight is “up”, the backend of the OTA is probly in front of the pier. If the DEC axis were to rotate (as it does when slewing as a result of a “goto”) , the backend of the OTA (eg camera) could crash into the pier. So the initial part of the slew from a CW up position is RA only movement… then the DEC will slew when the CW is in a “safe range”. My next question was if the CP3 w/ V2 chip supports Safety Slew … and sadly it seems it does not. Good to know (and I’m surprised at myself for missing this detail.) However… does APCC (or the V2 driver) compensate for the CP3, and implement the Safety Slew logic? It seems like it might (but I might need to read the manual a bit more to be sure). https://www.siriusimaging.com/Help/APCC/index.html?meridian_tab.htm Usually with the AP 1200/CP3-V2 I semi manually slew to objects, and if in a CW UP position, “manually” slew away from the pier first before doing a goto. I suppose the CP4 would help here when using the AP keypad, but it would probably also be better when using APCC etc. Thx for any clarifications/ corrections. -jeff _._,_._,_
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Konstantin von Poschinger #85909 Hi, don't worry, the CP3 also handle the safety slew! Grüsse Konni Konstantin v. Poschinger Hammerichstr. 5 22605 Hamburg 040/8805747 0171/1983476 toggle quoted messageShow quoted text Am 12.04.2022 um 22:43 schrieb Jeffc <jeffcrilly@...>: I was wondering about Safety Slew in the context of CP3 mounts. First tho, I had a question: .What is the purpose of the “safety slew”? And I found the answer in the docs: https://astro-physics.info/tech_support/mounts/servo/cp4-manual.pdf When counterweight is “up”, the backend of the OTA is probly in front of the pier. If the DEC axis were to rotate (as it does when slewing as a result of a “goto”) , the backend of the OTA (eg camera) could crash into the pier. So the initial part of the slew from a CW up position is RA only movement… then the DEC will slew when the CW is in a “safe range”. My next question was if the CP3 w/ V2 chip supports Safety Slew … and sadly it seems it does not. Good to know (and I’m surprised at myself for missing this detail.) However… does APCC (or the V2 driver) compensate for the CP3, and implement the Safety Slew logic? It seems like it might (but I might need to read the manual a bit more to be sure). https://www.siriusimaging.com/Help/APCC/index.html?meridian_tab.htm Usually with the AP 1200/CP3-V2 I semi manually slew to objects, and if in a CW UP position, “manually” slew away from the pier first before doing a goto. I suppose the CP4 would help here when using the AP keypad, but it would probably also be better when using APCC etc. Thx for any clarifications/ corrections. -jeff
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Jeffc #85917 This is what Im referring to…. Presumably, APCC takes care of it. Tho if using the Keypad with he CP3-V2 I would not expect a Safety Slew. I think I’ll do a dry run of this with a short OTA, and also compare the behavior to the Mach2. When the weather is better. -Jeff toggle quoted messageShow quoted text On Apr 12, 2022, at 10:59 PM, Konstantin von Poschinger <KPoschinger@...> wrote: Hi, don't worry, the CP3 also handle the safety slew! Grüsse Konni Konstantin v. Poschinger Hammerichstr. 5 22605 Hamburg 040/8805747 0171/1983476 Am 12.04.2022 um 22:43 schrieb Jeffc <jeffcrilly@...>: I was wondering about Safety Slew in the context of CP3 mounts. First tho, I had a question: .What is the purpose of the “safety slew”? And I found the answer in the docs: https://astro-physics.info/tech_support/mounts/servo/cp4-manual.pdf When counterweight is “up”, the backend of the OTA is probly in front of the pier. If the DEC axis were to rotate (as it does when slewing as a result of a “goto”) , the backend of the OTA (eg camera) could crash into the pier. So the initial part of the slew from a CW up position is RA only movement… then the DEC will slew when the CW is in a “safe range”. My next question was if the CP3 w/ V2 chip supports Safety Slew … and sadly it seems it does not. Good to know (and I’m surprised at myself for missing this detail.) However… does APCC (or the V2 driver) compensate for the CP3, and implement the Safety Slew logic? It seems like it might (but I might need to read the manual a bit more to be sure). https://www.siriusimaging.com/Help/APCC/index.html?meridian_tab.htm Usually with the AP 1200/CP3-V2 I semi manually slew to objects, and if in a CW UP position, “manually” slew away from the pier first before doing a goto. I suppose the CP4 would help here when using the AP keypad, but it would probably also be better when using APCC etc. Thx for any clarifications/ corrections. -jeff
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Ray Gralak #85920 The chart is correct. Safety slews are not native in the GTOCP3. However, APCC will automate safety slews with a GTOCP3. -Ray toggle quoted messageShow quoted text -----Original Message----- From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Jeffc Sent: Wednesday, April 13, 2022 2:52 PM To: main@ap-gto.groups.io Subject: Re: [ap-gto] Safety Slew and CP3 mounts? This is what Im referring to…. Presumably, APCC takes care of it. Tho if using the Keypad with he CP3-V2 I would not expect a Safety Slew. I think I’ll do a dry run of this with a short OTA, and also compare the behavior to the Mach2. When the weather is better. -Jeff On Apr 12, 2022, at 10:59 PM, Konstantin von Poschinger <KPoschinger@...> wrote: Hi, don't worry, the CP3 also handle the safety slew! Grüsse Konni Konstantin v. Poschinger Hammerichstr. 5 22605 Hamburg 040/8805747 0171/1983476 Am 12.04.2022 um 22:43 schrieb Jeffc <jeffcrilly@...>: I was wondering about Safety Slew in the context of CP3 mounts. First tho, I had a question: .What is the purpose of the “safety slew”? And I found the answer in the docs: https://astro-physics.info/tech_support/mounts/servo/cp4- manual.pdf When counterweight is “up”, the backend of the OTA is probly in front of the pier. If the DEC axis were to rotate (as it does when slewing as a result of a “goto”) , the backend of the OTA (eg camera) could crash into the pier. So the initial part of the slew from a CW up position is RA only movement… then the DEC will slew when the CW is in a “safe range”. My next question was if the CP3 w/ V2 chip supports Safety Slew … and sadly it seems it does not. Good to know (and I’m surprised at myself for missing this detail.) However… does APCC (or the V2 driver) compensate for the CP3, and implement the Safety Slew logic? It seems like it might (but I might need to read the manual a bit more to be sure). https://www.siriusimaging.com/Help/APCC/index.html?meridian_tab.htm Usually with the AP 1200/CP3-V2 I semi manually slew to objects, and if in a CW UP position, “manually” slew away from the pier first before doing a goto. I suppose the CP4 would help here when using the AP keypad, but it would probably also be better when using APCC etc. Thx for any clarifications/ corrections. -jeff
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